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UNITED STATES PATENT OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO TIIE VESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 502,536, dated August 1, 1893.

Application filed March 12, 1891. Serial No. 384,763. (No model.)

To a/ZZ whom, it may concern.-

Beit known that I, CHAELEs E. SCEIBNER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illilast separated.

nois, have invented a certain new and useful Improvement in Circuits for Electric-Arc Lamps, (Case No. 258,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to arc light systems, and its object is to provide circuits whereby arc lamps may be burned in groups, the members of the diiferent groups being so arranged preferably that one will burn after the other.

I-Ieretofore double carbon arc lamps have been employed so constructed and arranged that two or more pairs of carbons may be burned in one and the same lamp structure.

As shown in Letters Patent No. 147,827, granted Matthias Day, February 24, 1874, two sets of carbons are burned in alternate succession.

In Letters Patent No. 219,208, granted Charles F. Brush, September 2, 1879, two independently adjustable pairs of carbons are controlled by one and the same motor mechanism through the medium of a non-symmetrical lifter so that the upper member of one pair of carbons shall be first raised and separated from its mate, and immediately thereafter the upper member of the second pair raised and separated from its mate, so that the arc shall be established between the members of but a single pair, to wit: the pair Thus the pairs of carbons are burned in complete or reciprocal succession, the sequence of the burning being predetermined.

In Letters Patent No. 261,47 2, gran ted Hans .I Mller, July 18, 1882, twin lamps are shown so arranged that when one has burned out its carbons the other will be automatically switched into circuit.

By the use of my invention herein the switching apparatus between the two lamps is dispensed with. Moreover, I am enabled to burn,if desired, more than two in the same group. Ordinarily, however, I have found that two are sufficient.

My invention herein may be applied to any of 'the well known forms of single lamps, and speaking generally, my invention consists in placing the regulating mechanisms and the carbons in series multiple, thus causing one lamp to burn after the other. This action results from the law of the electric current rst disclosed as applied to electric are lamps in the said Day patent, to wit: that when two pairs of carbons are connected in multiple arc only one pair will burn at a time, the arc being first formed between the members of the pair having the lesser resistance.

My invention will be more readily understood by reference to the accompanying drawing, in which I have shown two electric arc lamps in connection with circuits embodying my invention.

The pair of lamps illustrated is of the general construction illustrated and described in my Patent No. 415,571, granted November 19, 1889. It will be observed that each lamp is an exact duplicate of the other, and that no part of the regulating mechanism of one lamp is connected with, or has any dependence upon or coaction with the regulating mechanism of the other. Thus in lamp 1 we have the ordinary lifting magnet a and the ordinary fine wire or regulating magnet b in the shunt of the arc. The lifting magnet d, when current is first established, draws down its armature lever c, and acting through the rocking lever d, link c, clutch lever f and clutch g, serves to lift the carbon rod h so as to separate the carbons t'. This action having taken place armature lever c remains held down and immovable during the entire time that the current remains closed through lifting magnet a. It will be observed that the rocking lever d is pivoted upon the fulcrum Zt of the armature lever lof feeding magnet b. A spring m resting against the arm of the pivoted armature lever l acts in opposition to magnet Z9. Thus feeding magnet h placed in the shunt around the arc acts upon the clutch mechanism in the ordinary way to permit the upper carbon to descend as the carbons burn away. The same description would apply to lamp 2. That is to say, in lamp 2 we have lifting magnet a and regulating magnet b; when current is first established magnet a draws down its armature lever c and by means of rocking lever d', link e', clutch lever f and clutch g lifts the carbon rod It so as to separate the carbons i. The lever c being thus moved when current is iirst estab- IOO lished remains down untilthe current is taken off from lifting magnet a. The rocking lever d is pivoted at 7a to the armature lever Z of feed magnet b. yThe spring 'm' is adj usted to press against the arm of the pivoted armature lever Z in opposition to the attractive force of feeding magnet h.

Thus I have described the two singlelamps, and it will be seen that one is the exact counterpart of the other. In connection with one of the lamps I preferably provide the shunt 'n which should have some slight resistance in order not to absolutely short circuit the lamp. The contacts o of this short circuit are arranged in any well knownway.

As shown in the drawingr the lifting magnets a a of the two lamps are in multiple arc; also the pairs of carbons il t" of the two lamps are in multiple arc all connected with the same circuit; that is to say, the lifting magnets of the two lamps and the carbons of the two lamps are in series multiple. The feeding magnet Z) of lamp l is in a shunt around the carbons i of its own lamp, and also around the carbons t" of the other lamp; in like manner the feeding magnet b is in ashunt around the carbonst" of its own lamp, and also around the carbons t' of lamp l. The current upon entering the lamp at hook p divides equally between the main electro magnts a a and these magnets are in consequence simultaneously energized and to the same extent. Each magnet will operate to draw down its own armature at the same time, and thus the carbons will be separated at the same time. The carbon rods being now held up springs m m respectively acting through the respective lever mechanisms so as to keep the two pairs of carbons separated, an arc will be formed between the members of one pair of carbons, the current, according to the law of carbons in multiple shown in the Day patent, selects a pair of carbons which happens to have the least resistance. A small part of the current will pass through the feeding electro magnets l) h around the arc, and these electro magnets will be energized greater or less according to the voltage of the arc. As the carbons of the burning pair consume, the arc will increase in length and cause a rise in its voltage, and consequently the current sent through the feeding magnets will be increased and this will cause both of them to move their respective carbon rods down. Should the carbons of the non-burning pair be brought into contact the arc between the carbons of the other pair will go out and a new one will instantly be established between the members of the pair thus brought into contact as they are again separated. This arc continuing to burn, a rise in its voltage will act to strengthen the current of its feeding magnet to the extent necessary to cause it to draw down its armature and lower the clutchto a point at which it will permit the rod to feed downward as this second pair of carbons is consumed.

Throughout the operation of the lamp the arc between the carbons t' is controlled solely by the feed electro magnet b, while the arc which is formed between the carbons t" is controlled solely by the feeding electro magnet Z9. When one set of carbons has been consumed the descent of the carbon rod of that pair will he arrested by its stop coming against the frame of the lamp in a well known way or otherwise; whereupon the voltage of the arc will become sufficient to cause the feeding electro magnet of the lamp which has not burned to bring its carbons in contact and separate them. Au arc being now established between this set the lamp first to burn will go out, and the other lamp which has been lighted will burn until its carbons are consumed, whereupon the automatic cut out will be brought into service.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. Two electric lamps having each a lifting magnet and a pair of carbons, and each having a feeding magnet in a shunt around both the carbons, of circuits connecting thelifting magnets and the pairs of carbons in series multiple, substantially as and for the purpose specified.

2. In an electric arc lamp system the combination with the lifting magnets of two different lamps connected in parallel circuit with one another, the sets of carbons of the two lamps connected in parallel circuit with one another and the two parallel circuits thus formed being in series, whereby both lifting magnets are energized to suspend their carbon rods no matter which lamp is burning.

3. The combination of two arc lamps connected in parallel circuit, the rod of the lifting carbon of each lamp being provided with a stop, feeding electro magnets in the shunt of each lamp to regulate the feeding of the carbons, and circuits, substantially as described, to cause both lamps to lift their carbons no matter which lamp takes the arc.

et. The combination with two arc lamps connected in parallel circuit, of means for lifting the different carbon rods no matter which lamp takes the arc, and feeding magnets for feeding the different carbon rods, whereby the lamps are made to burn in succession, substantially as specified.

5. The combination with two electric arc lamps in parallel branches of an electric circuit, each lamp having a feeding magnet in shunt of its own carbons, of a pair of cut out contact points controlled by one of the feeding magnets adapted to close a third parallel branch; whereby either lamp may be cut out, substantially as described.

In witness whereof I hereunto subscribe my name this 5th day of March, A. D. 1891.

CHARLES E. SCRIBNER.

Vitnesses:

GEORGE I). BARTON, ELLA EDLER.

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